/* mcp.c

   Copies one file to another, using mmap. */

#include <stdio.h>
#include <string.h>
#include <syscall.h>

int main(int argc, char *argv[])
{
    int in_fd, out_fd;
    mapid_t in_map, out_map;
    void *in_data = (void *)0x10000000;
    void *out_data = (void *)0x20000000;
    int size;

    if (argc != 3)
    {
        printf("usage: cp OLD NEW\n");
        return EXIT_FAILURE;
    }

    /* Open input file. */
    in_fd = open(argv[1]);
    if (in_fd < 0)
    {
        printf("%s: open failed\n", argv[1]);
        return EXIT_FAILURE;
    }
    size = filesize(in_fd);

    /* Create and open output file. */
    if (!create(argv[2], size))
    {
        printf("%s: create failed\n", argv[2]);
        return EXIT_FAILURE;
    }
    out_fd = open(argv[2]);
    if (out_fd < 0)
    {
        printf("%s: open failed\n", argv[2]);
        return EXIT_FAILURE;
    }

    /* Map files. */
    in_map = mmap(in_fd, in_data);
    if (in_map == MAP_FAILED)
    {
        printf("%s: mmap failed\n", argv[1]);
        return EXIT_FAILURE;
    }
    out_map = mmap(out_fd, out_data);
    if (out_map == MAP_FAILED)
    {
        printf("%s: mmap failed\n", argv[2]);
        return EXIT_FAILURE;
    }

    /* Copy files. */
    memcpy(out_data, in_data, size);

    /* Unmap files (optional). */
    munmap(in_map);
    munmap(out_map);

    return EXIT_SUCCESS;
}
